Fix return type of IteratorIterator::getInnerIterator #11100
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When creating an
IteratorIteratorwith an iterator ofTIterator, we can assume thatgetInnerIteratorwill return that sameTIteratortype. Technically, this change could be applied toOuterIterator, although that would require us to introduce aTIteratortemplate toOuterIterator, which may break existing usages beyond the default iterators for which stubs are provided. Please advise if it's ok to changeOuterIteratorto get an additional template for the iterator it's wrapping.